Shady,
Please remember that persistence can and does pay off...my husband brought up the topic shortly after we married 10 years ago, and it took 8 years before I came around to the idea. He'd bring it up periodically and one day I surprised him by giving it the go ahead. We'd been each other's first and only, and I honestly thought he was testing my loyalty or something when he first broached the subject.
So, keep at it (respectfully, of course) and maybe she'll come around. Good luck.
